code: def construct_dgl_server_env_vars(
      num_samplers: int,
      num_server_threads: int,
      tot_num_clients: int,
      part_config: str,
      ip_config: str,
      num_servers: int,
      graph_format: str,
      pythonpath: Optional[str] = "",
  ) -> str:
      """Constructs the DGL server-specific env vars string that are required for DGL code to behave in the correct
      server role.
      Convenience function.
  
      Args:
          num_samplers:
          num_server_threads:
          tot_num_clients:
          part_config: Partition config.
              Relative path to workspace.
          ip_config: IP config file containing IP addresses of cluster hosts.
              Relative path to workspace.
          num_servers:
          graph_format:
          pythonpath: Optional. If given, this will pass this as PYTHONPATH.
  
      Returns:
          server_env_vars: The server-specific env-vars in a string format, friendly for CLI execution.
  
      """
      server_env_vars_template = (
          "DGL_ROLE={DGL_ROLE} "
          "DGL_NUM_SAMPLER={DGL_NUM_SAMPLER} "
          "OMP_NUM_THREADS={OMP_NUM_THREADS} "
          "DGL_NUM_CLIENT={DGL_NUM_CLIENT} "
          "DGL_CONF_PATH={DGL_CONF_PATH} "
          "DGL_IP_CONFIG={DGL_IP_CONFIG} "
          "DGL_NUM_SERVER={DGL_NUM_SERVER} "
          "DGL_GRAPH_FORMAT={DGL_GRAPH_FORMAT} "
          "{suffix_optional_envvars}"
      )
      suffix_optional_envvars = ""
      if pythonpath:
          suffix_optional_envvars += f"PYTHONPATH={pythonpath} "
      return server_env_vars_template.format(
          DGL_ROLE="server",
          DGL_NUM_SAMPLER=num_samplers,
          OMP_NUM_THREADS=num_server_threads,
          DGL_NUM_CLIENT=tot_num_clients,
          DGL_CONF_PATH=part_config,
          DGL_IP_CONFIG=ip_config,
          DGL_NUM_SERVER=num_servers,
          DGL_GRAPH_FORMAT=graph_format,
          suffix_optional_envvars=suffix_optional_envvars,
      )
  
imports: import argparse
  import json
  import logging
  import multiprocessing
  import os
  import queue
  import re
  import signal
  import subprocess
  import sys
  import time
  from functools import partial
  from threading import Thread
  from typing import Optional
label_desc: Use image node_id 9 for calling a global function with example usage: construct_dgl_server_env_vars(num_samplers, num_server_threads, tot_num_clients, part_config, ip_config, num_servers, graph_format, pythonpath) and returns: server_env_vars_template